Stapling-machine.



J, B. CROFOOT.

STAPLNG MACHINE.

APPLICATION FILED ocT.2. I9I5.

v Patented Apr1 24, 1917.

winaooao pnrrn earns narrar oracion.

JOHN B. CROFOOT, OF CHICAGO, LLINOIS. I

STAPLING-MACHNE.

Specification of YLetters Patent.

Patented Apr. '2411, 1WD?.

Application filed October 28, 1915. Serial No. 53,469.

To all 'whom t may concern:

Be` it known that I, JOHN B. Ciioroor, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certainnew and useful Improvements in Stapling- Machines, andl, do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable othersskilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters and iigures ofreference marked -thereon, which form a part oi this specification.

This invention relates to new and useful improvements in tackng orstapling machines and the object in view is to generally improve uponand render more ecient this type of apparatus.

'lhe present invention consists essentially, rst in the provision of anovel means for advancing the 'staple strip to the proper position tohave a fastener severed and driven into an object. p Another and anessential feature of the invention consists inl the prpvision ofextension means upon the plunger cap for acting as an automatic stop andserving as'ameans to protectvthe spring which acts as a plunger.

Another feature of the invention consist in the provision of a`=l"s`haped lmife so arranged that, when removed, it will allow thestaple strip to drop from the casing.

The invention' consists further in various details oi construction andarrangements ot parts whereby the diderent features of the invention maybe readily assembled and disassembled, when desired, for repairs, etc.`

My invention isillusti'ated in the accompanying drawings, in which:

Figure. 1 is a central vertical sectional view through 'a tacking orstapling inachine emhodying the features of my invention.

Fig. 2 isa section on line 8 3 of Fig., 1. Fig. 3 is a perspective lviewoil the cutting lmiie. l

Reference new helingV had to the details of the drawings by numeral,1designates the casing o' the apparatus-which may be' of any suitablesize or shape and which is provided with a handle 2, and 3 is a verticalway formed near one end oi the casing and in which the plunger 4 is'adapted to have a vertical longitudinal movement. Said plunger has anotch 5 in one side and has a cap 6 which is hollow to receive the upperconfrom injury.

The forward end of the bar 13 is also. pro-.

vided with a shoulder 13a; adapted to cooperate With 'the shoulder 14formed at the base of the notch 5 of the plunger i for limiting theupward movement of the plunger 4.

Mounted within the slotted bottom of the casing isa block 11 having' acutter edge and which block is inverted T-shape in cross section, asshown, said cutter block being held in place by fastening means passedthrough registering apertu. i .s 12 in the walls of the slot and in saidcutter block. llt will be understood that said block also serves 'thepurpose of a guide ior the staple strip.

A longitudinally movable har 13 is mounted in a horizontal' recess inthe-casing and 1s held to its limit in one direction by means of acoiled spring 14 bearing intermediate the bottom of the recess in whichthe bar is mounted and the inner end of the latter.

Said bar 13., preferably of a suitable metal and case hardened, isrecessed` upon its under surface and carries a pivotai pin 15 upon whichthe upper end oia apawl 16 is pivoted. The free end ot said pawl isforked and is adapted to 'engage and feed forward a staple strip 17. Theforward end of the bar 13 is beveled as at 13 and isfadapted to 1 engagea beveled edge 3 formed in the edge of the plunger when the latter is inits normal elevated position, the bar 13 at its for ward end having ashoulder which iits over the lower end of the notch therein. A

spring 18 bears yieldingly against the pawl and .is adapted to hold thesame yieldingly against the staple strip which rests and moves upon theupper edge of the cutter block 11.

been fed forward, a second pawl, designated by numeral 18', is pivotallymounted upon In order to prevent a reverse'A movement to the staplestrip after having i a pin A19 and a spring 20 serves to hold the pawl18', the free end of which is notched or forked, in engagement with thestaple strip at a location adjacent to the' previous staple which hasbeen severed therefrom. In operation, the staple stripl is adjusted overthe cutter block in the manner shown in the vertical central sectionalview yof the l drawingsand, when the plunger 1s driven downward, thebeveled edge with the notch Itherein, coming against the beveled ledgeof the bar, will cause the latter to be forced back against the tensionof the spring 111.

The pawl16 being pivoted to said bar will 'strip from rearward movementduringjthev operation of the machine. When pressure is released from theplunger, the spring 9 bearing yieldingly thereon will return the plunger`to its farthest upper limit and,

when the notched portionthereof comes opposite the 'beveled end of thebar 13, the

spring 14: 4acting against the inner end of the latter will throw thebar13 out into the magere notch to its normal position and. in the vforwardmovement'of thebar 13 the pawl 16 will be moved therewith and feed thestaple member forward'so that another staple will be in position to besevered and driven upon.

the next downward thrust of the' plunger.

By 'the provision of a tacking'or 'stapling machine made in accordancewith my nvention, it will be noted that a movement is given the staplestrip through the means described and the cutter block is of such aconstruction that, when *being removed, 'the staple strip will readilyfall from the casing and, bythe provision of the cap as shownanddescribed, means is provided for Aprotecting and guiding the spring.

What I claim to be new 1s:-

In a stapling machine, a body, a reciprocating staple setting plunger, aspring for moving the plunger upwardly, a bar operating at right anglesto the reciprocating plun er, means carried by'the bar for feeding't estaples forward, and means carried by the plunger and coperating with'the bar for restricting the vertical movement of the plunger againstthe tension of the s ring. In testimony whereof I hereunto a X mysignature in presence of two witnesses.

JOHN B. CROFOOT.

A -Witnesses JOSEPH HILLER, GEORGE S. DUBOIS.,

